Answer:
The heart consists of four chambers, two atria (upper chambers) and two ventricles (lower chambers). There is a valve through which blood passes before leaving each chamber of the heart. ... They act as one-way inlets of blood on one side of a ventricle and one-way outlets of blood on the other side of a ventricle.
Explanation:
Answer: Its (D) all of the above
The major criteria for custom provisional fabrication is done by making preliminary impression and by making a cast preparation prior to tooth preparation. These steps are essential to fabrication process.
Represent acute symptoms that need curing